Rotary engine.



` BATENTBUDEG. 17, 19o?.

U. da E. DUCHESNE. ROTARY ENGINE. APPLIUATION rILn'n A'Pn. s. 1901.

2 SHEETS--SHBET 1.

ULRIO DUCHESNE AND ERNEST DUOHESNE, OF MONTREAL, QUEBEC, CANADA.

ROTARY ENGINE.

Specification of Letters Patent.

Patented Dec. 1'7, 1907.

Application filed April 3, 1907. Serial No. 365,141.

To all 'whom it may concern:

Be it known that we, ULRIG DUcI-rnsNn, a subject of the King of Great Britain, and resident of 133 Amherst street, in the city and district of Montreal, in the Province of Quebec, in the Dominion of Canada, and ERNEST DUcnEsNE, a subject of the King of Great Britain, and resident of 170 Second avenue, in the city and district of Montreal, in the Province of Quebec, in the Dominion of Canada, have invented certainnew and useful Improvements in Rotary Engines, of which the following is a specification.

This invention relates to improvements in rotary engines, as described in the present specification and illustrated in the accompanying drawings that form part of the same.

The invention consists essentially in the novel construction and arrangement whereby a rocker head swings across the expansion chamber during the revolution of the rotor and its blade and returns and forms a section of the casing wall and an uninterrupted passage for said blade on the turning of the shaft carrying said rocker head by suitable connections therewith to the main shaft.

-The objects of the invention are to increase the efficiency of the steam or air engine and particularly in the rotary type and to provide a simple means of taking advantage of the expansile properties .of the fluid without seriously interfering with the clear passage of the blade around the expansion chamber.

In the drawings, Figure 1 is a sectional perspective view having a portion of the casing cutaway at the top in order to show -the interior of the second expansion chamber. Fig. 2 is a sectional plan view of the engine. Fig. 3 is an end elevation showing the valve gears. Fig. 4 is a vertical sectional view through the second expansion chamber. Fig. 5 is a sectional perspective detail of a blade. Fig. 6 is a perspective detail of the rotating head. Fig. 7 is a perspective detail of a packing ring. Fig/8 shows a modification of the rocker head gear. Fig.

9 is an enlarged sectional detail of the inlet valve in the expansile Huid pipe operated from the main shaft.

Like numerals of reference indicate corresponding parts in each figure.

In this rotary type of engine, such features as the rotor turning within a circular chamber and the blade forming the piston extending from said rotor are known and also it is known to form a temporary back or wall for the expansile fluid during each revolution of the rotor, but it is with the particular construction ofthe head or wall, the means of operating the valve gears and the arrangement of the various communicating passages and the packing that this invention has to do, though it must be understood that the invention is not limited to any one or all of these features, and one or more of them may be omitted and replaced by other construction without departing from the spirit of our invention.

Referring to the drawings, 1 is the casing here shown as supported on the base 2. The casing 1 is preferably circular in form having the lateral extensions 3 and 1 therefrom, the said extensionsV containing valve chambers and communicating passages, as more fully explained hereinafter.

5 is an annular partition wall extending inwardly for a short distance from the inner wall of the casing 1. f

6 and 7 are headssecurely boltedjto each end .of the casing 1, respectively, and having the centrally arranged bearings 8 therein arranged.

9 is a shaft journaled in the bearings 8 and at deach end projecting beyond the heads 6 an 7. 1

10 is a rotor preferably formed of the two parts 11 and 12 the part 12 havin the-cen` tral circular recess 13 in one of its aces, into which the reduced end 14 of the part 11 fits.. The parts 1 1 and 12 are'k held together by the bolts 15, which extend through said parts and are secured by the nuts 16, the bolt heads and the nuts are suitably counter-sunk in the outer faces of the parts 11 and 12. The parts 11 and 12, thus bolted together, form the complete rotor 10, and as the part 11 has a reduced end 14:, an annular slot 17 is thereby formed, into which the wall 5 ex. tends, consequently forming .the expansion chambers 18 and 19, the chamber 18 being of narrower dimensions than the chamber 19 and in this way forming high Aand low pressure chambers.

20 are annular grooves in the outer faces of the rotor 10 and 21 are annular grooves in the inner walls of the heads 6 and 7 opposing the annular grooves 20, the said grooves having circumferentially ridged beds.y

22 are annular grooves in the inner walls of the slot 17and 23 are annulargrooves in the wall 5 opposing the annular grooves 227 the said grooves 22 and. 23 having circumferentially ridged beds.

24 are packing rings having circumferential ridges on their outer faces corresponding to the ridged beds of. the aforesaid grooves, one of said rings being inserted in each pair of the said grooves between. the rotor and the walls and forming ba'liies to the passage of expansile fluid inwardly from the chambers 1.8 and 19. 25 is a key fitting into corresponding grooves fastening said rotor to said shaft and insuring its rotation therewith.

26 are dove-tailed slots through the periphery of the parts 1,1 and 12 of the rotor 10, extending thereacross and in alinement one with the other.

'2712s a blade having a dove-tailed end inserted in the dove-tailed slot 26 in the part 1:1 and extending on every side to the walls of the expansion chamber 1-8.

28 is a blade having a dove-tailed end inserted in the slot 26 in the part 12 and extending on every side to the walls of the expansion chamber 19, the dove-tailed ends of Vthe blades 27 and 28 are firmly wedged into the slots 26 in the parts 11 and 12. d v 29 are slots longitudinally arranged in the side edge faces of the blades 27 and .28, and '3U are slots longitudinally arranged in the end edge faces of the said blades and meeting the slots ,29.

31 .are orifices Vextending through the blades 26 and 27 and connecting the slots 29 at each side of the blades, and 32 are `holes extending downwardly from the beds of the -slots 30.

33 are packing strips having the reduced upper ends 34 andthe ridged outer surface '35 at the lower end and the holes 36 therethrough intermediate of their length.

'The packing strips 33 are inserted in the slots 29 in the sides of the blade and are held therein by the pins 37 extending through the 'said blades at each side thereof and through the holes 36 which are -larger than the said pins and permit avlimited movement of said strips.

38 are springs introduced into the orifices 31 and exerting a constant outward pressure against the packing strips 33 and keeping said strips normally in engagement with the sidewalls of-the chambers.

39 are packing strips having `the slotted ends 40 fitting over the reduced ends 34 of the packing strips 33 and inserted in-the slots 30 in the end edge faces of said blades. The

said strips 39 have the holes '41 through which the pins 42 are inserted at the top end of r the blades 27 and 28. The said pins 42 are of smaller dimensions than the said holes and permit a certain play of the said stripsin the said slots 30.

44 are` spiral springs introduced into the the packing plates 53.

holes 32 and exerting a constant outward pressure on the packing strips 39 and holding said packing strips normally in engagement with the inner walls of the expansion chambers 18 and 19.

The lateral extension 3 of the casing 1 contains the valve chamber 457 from which the inlets 46 and 47 for the expansile iiuid extend to the chamber 48. rl`he chamber 48 opens into the expansion chamber 18.

49 are circular recesses in the side walls of the chamber 48, a portion of said recesses extending into the side Walls of the expansion chamber 18.

50 is a rocker head iixedly mounted on the shaft 51 the latter being journaled in suitable bearings in the side walls of the cham-4 ber 48.

The faces 52 of the rocker head 50 are arcl 53 are packing plates rigidly secured to or forming part with the rocker head 50 and having the circumferential slots 54 on the edge face thereof for the insertion of packing rings 55.

56 are slots extending across the ends of the rocker head 50 and through the edges of Y 4 57 are packing strips inserted in the slots 56 and having transverse slots therein through which said .packing rings y55 extend. The packing plates 53 .fit into the circular recesses 49 and turn therein with the rotation of said head 50.

The shaft 51 of the rocker head 5() extends beyond the wall of thechamb er 48, which is also the head 6 of the engine casing, and has secured to its outer end the crank 58, the said crank being connected with a suitable gear, described -in detail hereinafter.

59 is a rotary valve inserted in the valve chamber 45 and controlling the inlets 46 and 47 and having its stem 6() projecting through and beyond the faceplate 61 of said valve chamber.

62 is a crank fixedly secured on the extending end of the stem 60.

63 is a pipe connecting the chamber 43 at the opposite end through the head 6 with a supply of expansile iiud, the said pipe hav- 1n itsgleneth and the valve 65 at the lower end thereof. Y

The valve 65 in the pipe 63 is normally held to its seat 66 by the spring 67 and the stem 68 of the valve 65 extends downwardly through a suitable `packing gland 69 and through the lower end of the pipe 63.

a suitable cut-off cock 64 intermediate of from the casing 1 similar in construction to and 74, said outlet chambers opening into the expansion chamber 18 and having the l circular valve seats 75 formed in the walls thereof.

76 are valves normally resting on the seats 75 and spring-held thereto by the springs 77, said springs surrounding .the pins 78 from said valves.

79 are plugs closing the outer open ends of the chambers 73 and 74 and having the inner recesses 80, into which, on the lifting of the valve 76, the pins 78 extend. 1t will be thus seen that the outlets 73 and 74 are arranged at the opposite side of the expansion chamber 18 from the inlets 46 and 47 and are placed so as to insure the exhaust from the chamber 18 at the greater distance from the respective inlets. The lateral extension 4 also contains a chamber 81 corresponding to -the chamber 48 and a rocker head 82 corresponding to the rocker head 50, with the distinction that the chamber 81 opens into the expansion chamber 19 and the rocker head 82 is of wider dimension than the rocker head 50 and swings across the opening from the chamber 81. The rocker head 82 is ljournaled in the side walls of the chamber 81 and has its shaft 83 extending through the head 7 and a crank 84 ixedly secured on the outer end of said shaft. 1n all other respects the construction is precisely the same as the rocker head in the expansion chamber 18.

85 and 86 are outlet chambers opening into the expansion chamber 19, and 87 and 88 are passages extending from the outlet chambers 85 and 86 and forming the means of communication from said outlet chambers ywith the valve chamber 45. 89 and 90 are valves in said outlet chambers 85 and 86 corresponding precisely in construction to the valves 76 in the outlet chambers 73 and 74.

91 is a port through the valve 59 forming the exhaust opening for either of the passages 87 or 88.

92 is a bracket secured to the head 6 to one side and in line with the shaft 9 and having the squared hole 93 therethrough.

94 is a cylinder or pot secured at its open end to the outside of the bracket 92 around the hole 93.

95 is a bracket secured to the head 6 in alinement with the shaft 9 and the bracket 92 and having a square hole therethrough.

96 is a frame encircling the shaft 9 and having the squared rods 97 and 98 extending outwardly therefrom and preferably forming part therewith and sliding in the squared holes in the said brackets 92 and 95.

99 is a plunger at the extremity of the rod 97 and operating in the cylinder 94.

100 is a lug projecting inwardly from the frame 96 and forming journal bearings for the roller 101. 102 is a bracket clamped and adjustably arranged on the rod 98 in proximity to the frame 96 and having an outwardly projecting lug 103 pivotally connected to the crank 58 by the link 104. 105 is a cam fixedly secured on the shaft 9 and at each revolution engaging the roller 101 and sliding the rods 97 and 98 in the brackets 92 and 95, thereby drawing out the plunger 99 against the air pressure and turning the shaft 50 through its connection to the bracket 102 bythe link 104 and the crank 58, and thus turning the rocker head 49 once during each revolution of the -shaft 9, for the purpose as wfill be more fully set forth in detail hereina ter.

' The return of the rods 9 7 and 98 to their normal position is assured by the pressure of the air compressed by the forward movement of the plunger and rthe consequent vacuum to the rear of the plunger.

The frame 106 and rods 107 and 108 and the cylinder 109 supported in the brackets 110 and operated by the cam 111 are precisely similar to the gear represented by the frame 96 and rods extending therefrom, and

l are supported from the head 7 and operate the rocker head 82 in expansion chamber 19.

112 is a rocker arm pivoted on the pin 118 extending from the head 6 and having journaled in suitable bearings at its inner end the roller 114 and at its outer end abutting the stem 68 of the valve 65.

115 is a cam iixedly mounted on the shaft 9 and at each revolution of the said shaft engaging the roller 114 and consequently automatically regulating the admission of expansile fluid for the operation of the engine.

116 is a hand lever iixe'dly secured to the stem of the rotary valve 117 turning in the valve chamber 70, the said valve 117 controlling the inlets to the chamber 19.

118 is a rod pivotally secured at one Aend to the said lever 116 intermediate of the length of said lever and at the other end pivotally secured to the crank 62, thus connecting the stems of the valves in the chambers 45 and and insuring their coincident operation.

Having described the various parts in detail, we shall now more particularly explain the operation thereof.

The cock 64 is turned to permit the passage of expansile iiuid from the supply through to the end of the pipe 63, where the flow is arrested by the valve 65.V The valve 59 is then opened by either pushing or pulling on the lever 116, according to the direction in which it is intended to rotate the shaft 9. Presuming that the lever 116 is pushed over to open the inlet 46, on the lifting of the valve stem 68 expansile fluid will enter into the valve chamber 45 and flow on through the inlet 46 and through the chamber 48 into the expansion chamber 18. The expansile fluid thus entering the expansion chamber 18 expands and presses on the blade i 27 backing up against the rocker head 50 and thus rotating the rotor 10. The operating fluid on reaching the outlet chamber 74 does not pass beyond the end of the passage 72, as the valve 117 bars its further 110W, but when the blade has traveled beyond the outlet chamber 73, the expansile fluid lifts the valve in the said outlet chamber and enters the passage 71 and from there forces its Way on into the valve chamber `70 Where it passes along to the port leading to the chamber 81 and through the opening from said chamber into the expansion chamber 19, Where it is further expanded and presses on the blade 28, the rocker head 82 forming the back or Wall. The force exerted in the expansion chamber 18 for rotating the rotor 10 and shaft 9, is thus supplemented, or in other Words, the use of the expansile fluid is compounded. The expansile fluid continues pressing on the blade l28, until the outlet chamber 86 is reached, Where it lifts the valve and passes into the passage 88 and through the port 91 to the atmosphere. In order to rotate the shaft in the opposite direction, the exp ansile fluid enters through the inlet 47, the lever 116 being pulled so as to close the openings, Which have been used in the operation just described. The expansile fluid enters through the inlet 47 and through the chamber 48 on the opposite side of the rocker head 49 and into vthe expansion chamber and exhausts into the low pressure chamber through the outlet 74, in place of through the outlet 78, as described in the operation of the machinein the other direction. The expansilefluid, Which reaches the loW pressure chamber, exhausts through the out* .let chamber85 and the passage 87 and the port 91, instead of through the outlet 86 and the passage 88, When the rotor is turning in the opposite direction. In the rotation of the shaft 9 the cam 105 is also rotated and as this cam at each revolution of the shaft engages the roller 1'01, the rods 97 and 98 are slid in their supports, causing the crank 58 to be thrown over and the shaft 51 carrying the rocker head turned. The turning of the said shaft 51 swings the rocker head 50 around, so that it becomes to all intents and purposes, part of the circular Wall of the chamber 18, the curve of' said head forming the continuation of the said chamber. The passage is thus clear for the blade 27 and immediately on the said blade traveling beyond the rocker head the cam Whichhas engaged the said roller passes vthereover and permits the return of the plunger 99 to the closed end of the cylinder 94, the operation of which has already been explained in the foregoing description. The shaft 51 is in this manner turned in the opposite direction and the rotatable head 50 swung across the expansion chamber 18 forming the back or` Wall against which the expansile fluid backs up in forcing the blade 27 forward. The operation of the rocker' head 82 in the low pressure chamber is precisely the same.

ln the modification of the gear for operating the rocker head, shown in Fig. 8, 119 is an eccentric mounted on the main shaft 9, Where it projects beyond the casing head, and 120 is the strap of the eccentric having the rod 121 extending therefrom. 122 are brackets secured to the head 6 of the casing to one side of the shaft 9 and having square holes therethrough. 123 is a square rod slidably arranged in the brackets 122. 124 is a pin rigid With the rod 123 and extending outwardly therefrom between the brackets 122. 125 is a roller liournaled on the pin 124. 126 is a cani having the angular slot 127, through which the pin 124 and the roller 125 extend.. The cam 126 is rigidlyT secured on the projecting end of the rocker head shaft 51., consequently the change of position of the pin 124 in the slot 127 Will affect the shaft 51. The eccentric rod 121 is pivotally secured at its outer end to the pin 124, therefore at each revolution of the main shaft 9, the rod 123 is moved back and :forth in the brackets 122, and as the pin. 124 extends from said rod and is rigid therewith and. also extends through the slot 127, the cam 126 turns at each stroke of said rod and carries With it the shaft 51, which imparts the rocking motion to the rocker head.

It Will readily be understood that the eccentric and cam mechanism illustrated in Fig. 8 Will be precisely the same for the operation of the rocker head in the second expansion chamber and also that the details of the connection of the eccentric With said rocker head shaft may be modified.

Wl'iat We claim our invention is: f

1. ln a rotary engine, the combination With a casing having a lateral extension and a shaft vjourn aled in suitable bearings in said casing and. rotor mounted on said shaft and forming an expansion chamber Within said casing, of a rocker head closing said opening and forming with either of its faces a continuation of the curve of the inner Wall of said expansion chamber, a shaft journaled in suitable bearings in said extension and carrying said rocker head, a slidably arranged gear supported by said casing and connected to the shaft of and rocking said head at each revolution of the rotor shaft, and a blade extending frcm said rotor forming a piston Within. said. expansion chamber, substantially as described.

2. ln a rotary engine, the combination With a casing having a lateral extension and a shaft ournaled in suitable bearings in said `casing and rotor mounted on said shaft and forlining an expansion chamber Within said caslng, of a rocker head closing the opening to said expansion chamber from the cham- .ing a ournal bearing, a roller journaled in ber contiguous thereto and having a curved face forming a continuation of the curve of l the inner Wall of said expansion chamber', a shaft journaled in suitable bearings in said extension and carrying said rocker head, a crank secured to the end of said shaft, brackets secured to a head of said casing in horizontal alinement With said shaft and havingI holes therethrough, a frame encircling said shaft and having rods `irojecting laterally therefrom through the holes in said brackets and a lug extending inwardly formsaid bearing, a bracket clamped to one of said rods and adjustably arranged, a link pivot-ally securing said bracket to said crank, a cam mounted on the main shaft engaging said roller at each revolution of said main shaft, means for returning said frame after engagement with said cam, and a blade extending from said rotor and forming a piston Within said expansion chamber, substantially as described.

3. In a rotary engine, the combination with a casing having a lateral extension and a shaft journaled in suitable bearings in said casing and rotor mounted on said shaft and forming an expansion chamber Within said casing, of a rocker head closing the opening to the expansion chamber from the chamber contiguous thereto and forming the continuation of the inner Wall of said ex ansion chamber, a shaft journaled in suitafile bearings in saidextension and carrying said rocker head, a crank secured to the end of said shaft, brackets secured to a head of said casing and having squared holes therethrough and arranged in horizontal alinement with the main shaft, a frame encircling said main shaft and having squared rods extending therefrom and slidably arranged in said brackets and a lug extending inwardly from said circular part and having suitable journal bearings, a roller journaled in said lug bearings, a bracket clamped to one of said'rods adjustably arranged thereon, a link pivotally joining said clamped bracket With said crank, a cylinder or pot secured to one of the brackets from the casing head and surrounding the hole therethrough, a plunger at the end of the other of said rods operating in said cylinder or pot, and a blade extending from said rotor and forming the piston Within said exn pansion chamber, substantially as described. 4. In a rotary engine, the combination With a casing having a lateral extension and a shaft journaled in suitable bearings in said casing and rotor mounted on said shaft and forming an expansion chamber Within said casing, of a rocker head having curved faces adapted to form a continuation of the curve of said expansion chamber in the opening from a contiguous chamber in said lateral extension, a shaft journaled in suitable bearings in said lateral extension and carrying said' rocker head, packing plates encircling said shaft and rigid With said rocker head and adapted to turn in corresponding recesses in the Walls of the said. rocker head chamber, means for operating said rocker head connected to the shaft thereof, and a blade extending into said expansion chamber forming a Vpiston operating. therein, substantially as described. 1

5. In a rotary engine, the combination With a casing having a lateral extension and a shaft journaled in suitable bearings in said casing and a rotor mounted on said shaft and forming an expansion chamber Within said casing, of a rocker head having curved faces forming the continuation of the curve of the inner Wall of said ex ansion chamber across the opening from t e chamber contiguous thereto and longitudinal slots in the end faces thereof, ypacking strips in said slots having transverse slots therein adjacent to each end thereof, a shaft journaled in suitable bearings in said lateral extension and carrying said rocker head, packing plates encircling said shaft and4 rigid with said rocker head and having circumferential slots, packing vrings in said slots, said packing plates being adapted to turn in correspondingrecesses in the Walls of said rocker head chamber, means for operating said rocker head, and a blade extending from said rotor and forming the piston operating in said expansion chamber, substantially as described. y f

6. In a rotary engine, the combination With the casing having lateral extensions therefrom and chambers formed Within said extensions and a shaft journaled in suitable bearings in said casing, of a rotor having a circumferential slot in the periphery/thereof towards one side, a partition Wall from said casing extending into said slot and forming y rst and second exiinsion chambers, rocker heads journaled in t e Walls of chambers contiguous to said expansion chambers and closing the openings from said chambers to said expansion chambers and forming a continuation of the inner Walls of said expansion chambers across said openings, means for operating said rocker heads, blades extending from said rotors and forming the pistons operating in said expansion chambers, outlet chambers leading from said first ex` ansion chamber to the second expansion c amber and suitably controlled, and outlet chambers leading to the final exhaust opening, substantially as described.

7. In a rotary engine, the combination with the casingv having suitable bearings therein arranged and lateral extensions containing valve chambers and rocker head chambers and a plurality of passages from said valve chambers, of a rotor having a circumferential slot in the periphery thereof to- Wards one side, a partition extending inheads suitably journaled in the walls of said rocher head chambers and closing the openings from said chambers to said expansion chambers and forming the continuation of the wall of said expansion chambers across said openings, rotary valves in said valve chambers having the stems extending beyond the casing, a crank secured to the end of one of said valve stems and a lever secured to the end of the other ofsaid valve stems and a rod pivotally connecting said crank and said lever and operating said rotary valves coincidently, a pair of outlet chambers connected by pasasges to a valve chamber, the one of said outlet chambers at the greater distance from Aits corresponding inlet passage being adapted to permit the flow of exp ansile fluid therefrom through the pass age and into a valve chamber and on through into the second expansion chamber, and a pair of outlet chambers, the one of the latter outlet chambers at the greater distance from the inlet4 to said second expansion chamber being adapted to permit the flow of fluid through to the final exhaust, and blades extending from said rotors and forming the pistons in the first and second expansion chambers divided by said partition, substantially as described.

S. In a device of the class described, in combination, a casing and a rotor turning therein forming first and second expansion chambers therewithin, valve and rocker head chambers adj oining` said casing and communicating therewith by means of suitable inlet and,- outlet passages, outlet chambers connected to said passages having valve seats in the wall thereof, valves spring-held to said seats, plugs closing said outlet chambers having recesses in the interior walls thereof for the travel of the pins from said valves, rotary valves in said valve chambers controlling the inlets to said expansion chambers, rocker heads adapted to swing across said expansion chambers at each revolution of the rotor, and blades extending from said rotor and forming the pistons Within said eX- pansion chambers, substantially as described.

9. In a device of the class described, in combination, a casing and a rotor operating within said casing and forming hrst and second expansion chambers therewithin, valve and rocker head chambers forming lateral extensions from saidmain casing and communicating therewith by suitable passages, rocker heads in said rocher head chambers adapted to swing across said expansion chambers once in every revolution of the rotor, rotary valves in said valve chambers, outlet chambers from said first and second expansion chambers and passages connecting said outlet chambers with said valve chambers and spring-controlled valves in said outlet chambers, substantially as described.

10. In a device of the class described, in

combination, a casing having suitable inlets and outlets, a rotor journaled therein and forming a circular expansion chamber and having a dove-tailed slot thereacross, a blade having a dove-tailed end and wedged in said slot and longitudinal slots in the side edge faces and a longitudinally arranged slot in its end edge face meeting the slots in the said side edge faces, packing strips having holes therethrough intermediate of their length and reduced ends and inserted. in said side slots, a packing strip having slotted ends inserted over said reduced ends and introduced into the said end slot and having holes intermediate of its length, pins of smaller dimensions extending through said hdles and secured in said blade, and means forv constantly pressing said strips outwardly, substantially as described.

11. In a device of the class described, in combination., a casing having suitable inlets and outlets, a rotor turning therein and. forming a circular expansion clliamber and having a dove-tail slot therein, a blade having a dove-'tail end wedged into said slot and slots longitudinally arranged in the side edge faces and slots longitudinally arranged in its end edge facemeeting the aforesaid slot and orifices therethrough connecting said side slots and holes extending downwardly from the bed of said end slot, packing strips having reduced ends and holes therethrough intermediate of their length and inserted in said side slots intermediate of their length, a packing strip having slotted ends tting over said reduced ends and holes therethrough intermediate of their length, pins of smaller dimensions extending through said holes in said strips and fixedly secured in said blade and springs in said orices and said holes in the blade and exerting a constant outward pressure on said strips, substantially as described.

12. `In a device of the class described, the combination with the casing having bearings centrally arranged therein and suitable inlets' and outlets and a shaft journaled in said bearings, of a rotor keyed to the said shaft and formed in two parts one of said parts having a central circular recess in one of its faces and the other of said parts having a reduced end inserted in said circulard recess and forming with said other Vpart a circumferential slot in the rotor, the said parts being securely bolted together and having arranged in each a dove-tail slot across the peripheries thereof, and blades having dove-tailed ends inserted in said dove-tail slots and forming the pistons within the expansion chambers formed by said rotor and said casing, substantially as described.

13. In a device of the class described, the combination with the casing having suitable inlets and outlets and annular grooves in the inner walls thereof, and a shaft journaled in suitable bearings in said casing, of a\rotor mounted on said shaft and having annular slots opposing the aforesaid groove, said slots having circumferentially ridged beds and packing rings having circumferential ridges on their side faces and introduced between the opposing annular slots, substantially as described.

14. In a device of the class described, the combinationwith the casing having suitable inlets and outlets and annular slots in the inner end Walls thereof having ridged beds and bearings centrally arranged therein and a.

shaft journaled in said bearings, of a rotor keyed to said shaft and having a circumferential slot in theperiphery thereof and annulargrooves, having ridged beds, in the outer faces of said rotor opposing the said annular grooves in the Walls of the heads and annular grooves in the Walls of said slot having ridged beds, a partition Wall extending from said casing inwardly into said slot and having annular grooves ridged and opposing the aforesaid annular grooves in the said circumferential slot and packing rings having ridged faces coacting With the ridged beds of said grooves, substantially asdescribed.

15. In a rotary engine, the combination with a casing Vhaving a lateral extension therefrom and chambers formed Within said lateral extension and a shaft and rotor forming an expansion chamber Within said casing, of a rocker head journaled in said extension and rocking in the chamber contiguous to said expansion chamber and having curved faces adapted to form a continuation of the curve of theinner Wall of said expansion chamber, a blade extending from said rotor' March, 1907.

ULRIC DUCHESNE. ERNEST DUCHESNE.

Witnesses:

G. TRESIDDER, P. SHEE. 

